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check thermostat in boiling water make sure it opens. make sure it is not fitted up side down, check the radiator pressure with a gauge there may be a leaking head gasket. also check the relief valve on the radiator cap.

Is the engine holding it's anti-freeze? When I do a total rebuild I usually have the block and heads boiled in a hot tank and replace all the freeze plugs. If you don't have any leaks then I would try a different thermostat. Possibly a little lower degree one. You can check your thermostat by putting it in a pan of water and heating it up to boiling while monitoring the temperature with a thermometer. If it's a 180 degree thermostat you will be able to see it open about the time temperature gets 180.

No!!!!...Yes!!!No, the sending unit is working right. Ideas? Yes, I think the problem is the water pump. Don't drive it overheated till you get a new water pump or have it inspected. You say it's a small leak where it bolts to block, but maybe it's the "weep hole" on bottom of pump leaking, meaning the internal seals on the pump have failed. If so, it won't be a small leak, it will leak all the time engine is running. A lot may be swept away by air, or by evaporating. Check it out. That's a likely cause of overheating.

Either the thermostat is stuck in the closed position...or the engine cooling system cannot pressurize...both will cause an overheat condition.
A blown head gasket can cause overheat condition as well as fluid loss (boil over)

I'd maybe remove the thermostat and either just replace it or not have a thermostat installed just to see if it still boils over. If it boils over with no thermostat installed then you're getting into possible leak in cooling system...i.e. water pump weep hole, hose or radiator leak...or a blown head gasket.

SMOKE UNDER HOOD COULD BE COOLANT LEAK FROM RADIATOR ITSELF OR CHECK FOR LEAKING TOP RADIATOR HOSE AND CHECK FOR LEAKING BOTTOM RADIATOR HOSE.LOOK UNDER THE HOOD IF COOLANT BOILING OUT COOLANT OVERFLOW JUG ENGINE OVERHEATING FROM BAD THERMOSTAT OR BAD WATER PUMP.CHECK FOR COOLANT LEAK AT WATER PUMP WEEP HOLE.IF SO WATER PUMP NEED REPLACING.ADD MORE COOLANT UNTIL LEVEL CORRECT.TRY LOCATE LEAK. IF CAR OVERHEATED AND BOILED IT OUT. SMOKE UNDER THE HOOD CAN ALSO BE CAUSED BY LEAKING VALVE COVERS WHICH CAN BE FIRE HAZARD IF OIL LEAKS ON HOT EXHAUST MANIFOLD.

I would check the thermostat. It should be in the housing that the upper radiator hose connects to. I would take the thermostat and put it in a pan of water on a stove, if the thermostat doesn't start to open before the water begins a rolling boil, the thermostat is probably stuck closed.